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Definitions of backcheck:
verb: (transitive, ice hockey) To check (an opposing player) while skating toward or near one's own goal.
verb: (intransitive, ice hockey) To engage in checking while skating toward or near one's own goal.
verb: (quality control) To check someone else's work after they have completed it, in a backward-looking type of review or audit, especially one that runs on a backchannel workflow in parallel with the main workflow (and thus is not a rate-determining or throughput-bottlenecking step).